<!-- 分类菜单和弹层 -->
<template>
  <div class="home-category">
    <ul class="menu">
      <li v-for="item in menuList" :key="item.id" @mouseenter="categoryId = item.id">
        <RouterLink :to="`/category/${item.id}`">{{ item.name }}</RouterLink>
        <template v-if="item.children">
          <RouterLink
            v-for="sub in item.children"
            :key="sub.id"
            :to="`/category/sub/${sub.id}`"
          >{{ sub.name }}</RouterLink>
        </template>
        <template v-else>
          <Skeleton width="60px" height="18px" style="margin-right: 10px;" />
          <Skeleton width="55px" height="18px" />
        </template>
      </li>
    </ul>
    <!-- 弹层 -->
    <div class="layer">
      <h4 v-if="currCategory">
        {{ currCategory.id === 'brand' ? '品牌' : '分类' }}推荐
        <small>根据您的购买或浏览记录推荐</small>
      </h4>
      <ul v-if="currCategory && currCategory">
        <li v-for="item in currCategory.goods" :key="item.id">
          <router-link :to="`/product/${item.id}`">
            <!-- <img :src="item.picture" alt /> -->
            <img v-lazyload="item.picture" alt />
            <div class="info">
              <p class="name ellipsis-2">{{ item.name }}</p>
              <p class="desc ellipsis">{{ item.desc }}</p>
              <p class="price">
                <i>¥</i>
                {{ item.price }}
              </p>
            </div>
          </router-link>
        </li>
      </ul>

      <ul v-if="currCategory && currCategory.brands && currCategory.brands.length">
        <li class="brand" v-for="item in currCategory.brands" :key="item.id">
          <router-link :to="`/product/${item.id}`">
            <!-- <img :src="item.picture" alt /> -->
            <img v-lazyload="item.picture" alt />

            <div class="info">
              <p class="place">
                <i class="iconfont icon-dingwei"></i>
                {{ item.place }}
              </p>
              <p class="name ellipsis">{{ item.name }}</p>
              <p class="desc ellipsis-2">{{ item.desc }}</p>
            </div>
          </router-link>
        </li>
      </ul>
    </div>
  </div>
</template>

<script>
import { useStore } from 'vuex'
import { reactive, computed, ref, } from 'vue'
import { findBrand } from "@/api/home"
export default {
  name: 'HomeCategory',
  // 1. 获取vuex的一级分类，并且只需要两个二级分类
  // 2. 需要在组件内部，定义一个品牌数据
  // 3. 根据vuex的分类数据和组件中定义品牌数据，得到左侧分类完整数据(9分类+1品牌)数组
  // 4. 进行渲染即可
  setup() {
    const store = useStore()

    // 左侧栏中指定品牌
    const brand = reactive({
      id: 'brand',
      name: '品牌',
      children: [{ id: 'brand-chilren', name: '品牌推荐' }],
      brands: []
    })
    // 创建左侧菜单数据
    const menuList = computed(() => {
      const list = store.state.category.list.map(e => {
        return {
          id: e.id,
          name: e.name,
          // 防止初始化没有children的时候调用slice函数报错
          children: e.children && e.children.slice(0, 2),
          goods: e.goods
        }
      })
      list.push(brand)
      return list
    })
    /**
     * 上面的计算属性是异步的，此操作会被覆盖
     * menuList.value.push(brand)
     */

    // 滑动显示弹层信息
    const categoryId = ref(null)
    const currCategory = computed(() => menuList.value.find(e => e.id === categoryId.value))


    findBrand(9).then(ret => {
      brand.brands = ret.result
    })

    return {
      menuList,
      categoryId,
      currCategory,

    }
  },

}
</script>

<style scoped lang='less'>
.home-category {
  width: 250px;
  height: 500px;
  background: rgba(0, 0, 0, 0.8);
  position: relative;
  z-index: 99;
  .menu {
    li {
      padding-left: 40px;
      height: 50px;
      line-height: 50px;
      &:hover {
        background: @xtxColor;
      }
      a {
        margin-right: 4px;
        color: #fff;
        &:first-child {
          font-size: 16px;
        }
      }
    }
  }

  .layer {
    width: 990px;
    height: 500px;
    background: rgba(255, 255, 255, 0.8);
    position: absolute;
    left: 250px;
    top: 0;
    display: none;
    padding: 0 15px;
    overflow: hidden;
    h4 {
      font-size: 20px;
      font-weight: normal;
      line-height: 80px;
      small {
        font-size: 16px;
        color: #666;
      }
    }
    ul {
      display: flex;
      flex-wrap: wrap;
      li {
        width: 310px;
        height: 120px;
        margin-right: 15px;
        margin-bottom: 15px;
        border: 1px solid #eee;
        border-radius: 4px;
        background: #fff;
        &:nth-child(3n) {
          margin-right: 0;
        }
        a {
          display: flex;
          width: 100%;
          height: 100%;
          align-items: center;
          padding: 10px;
          &:hover {
            background: #e3f9f4;
          }
          img {
            width: 95px;
            height: 95px;
          }
          .info {
            padding-left: 10px;
            line-height: 24px;
            width: 190px;
            .name {
              font-size: 16px;
              color: #666;
            }
            .desc {
              color: #999;
            }
            .price {
              font-size: 22px;
              color: @priceColor;
              i {
                font-size: 16px;
              }
            }
          }
        }
      }
    }
  }
  &:hover {
    .layer {
      display: block;
    }
  }
}

.skeleton {
  animation: fade 1s linear infinite alternate;
}
@keyframes fade {
  from {
    opacity: 0.2;
  }
  to {
    opacity: 1;
  }
}
</style>